Polyalkylhydrosiloxanes as inorganic silicate stabilizers

Abstract

Polyalkylhydrosiloxanes that are soluble in glycol are used to stabilize antifreeze/coolant formulations that contain inorganic silicate corrosion inhibitors. The stabilizers have the following formula Me3Si-O-[Si(Me)2-O]x-[SiHMe-O]y-SiMe3 where the ratio of x to y is from 0 to about 10.

We claim: 
     
       1. A gelation resistant glycol composition comprising: (a) an alkylene glycol, an alkylene glycol ether or mixtures thereof,   (b) an amount of an inorganic silicate effective to reduce corrosion, and   (c) an amount, effective to resist gelation, of a glycol soluble organosiloxane polymer having the formula   Me.sub.3 Si--O--[Si(Me).sub.2 --O].sub.x --[SiHMe--O].sub.y --SiMe.sub.3        where the ratio of x to y is from 0 to about 10.   
     
     
       2. The composition of claim 1 wherein the amount of organosiloxane polymer ranges from about 0.001 to about 0.1 weight percent based on the total composition. 
     
     
       3. The composition of claim 1 wherein the amount of organosiloxane polymer ranges from about 0.01 to about 0.1 weight percent based on the total composition. 
     
     
       4. The composition of claim 1 wherein the organosiloxane polymer has a ratio of x to y of from 0 to about 2.